Magnetic disk device and data verification control method in the device

Abstract

According to one embodiment, a magnetic disk device having a disk, includes: a flag updating module configured to register a flag used when data is written onto the disk, the data is read from the disk and whether to verify the data or not is determined, so as to be associated with each of a plurality of predetermined temperature sections; a temperature detector configured to detect an environmental temperature of the magnetic disk device; a verifying module configured to determine whether to execute the verification or not according to a flag where the detected environmental temperature corresponds to one temperature section of the plurality of temperature sections and that is registered by the flag updating module so as to be associated with the one temperature section; and a measuring module configured to measure an error rate at a same point in time as the verification.

1 . A magnetic disk device, comprising:
 a temperature detector configured to detect an environmental temperature;   a flag updater configured to register a flag associated with a temperature section of a plurality of temperature sections, the temperature section corresponding to the environmental temperature;   a verifier configured to determine whether to execute a verification based on the flag; and   a measuring module configured to measure an error rate at a same time as the verification.   
     
     
         2 . The magnetic disk device of  claim 1 , wherein
 when a first flag associated with a first temperature section is not set, the flag updater is configured to update a second flag associated with a second temperature section on an ordinary temperature side of the first temperature section to an unset condition.   
     
     
         3 . The magnetic disk device of  claim 1 , wherein
 when the error rate is higher than a first value, the flag updater is configured to set the flag.   
     
     
         4 . The magnetic disk device of  claim 3 , further comprising
 a parameter adjuster configured to adjust a parameter associated with the environmental temperature to be suitable for the environmental temperature when the error rate is higher than the first value.   
     
     
         5 . A data verification control method in a magnetic disk device, comprising:
 identifying a temperature section of a plurality of temperature sections, the temperature section corresponds to an environmental temperature detected by a temperature detector;   registering a flag in an identification flag table, the flag is associated with the temperature section; and   determining whether to execute a verification based on the flag.   
     
     
         6 . The data verification control method of  claim 5 , wherein
 when a first flag associated with a first temperature section is not set, a second flag associated with a second temperature section on an ordinary temperature side of the first temperature section is updated to an unset condition.   
     
     
         7 . The data verification control method of  claim 5 , wherein
 when the error rate measured at a same time as the verification is higher than a first value, the flag is set.   
     
     
         8 . The data verification control method of  claim 7 , further comprising
 adjusting a parameter associated with the environmental temperature to be suitable for the environmental temperature when the error rate is higher than the first value.